NHXLC Fire-Resistant Compact Busway

Structural characteristics

◆Inherits the same "sandwich"compact laminated phase conductor structure as the"XLC Series", resulting in a compact busway profile with minimal footprint.The system delivers low   impedance,reduced voltage drop,and excellent dynamic/thermal stability,while eliminating any risk of "chimney effect"during fire events.

◆The enclosure is constructed from cold-formed thin-wall steel profiles.Its side panels feature our proprietary double-layer hollow structure,which utilizes sealed cavities to block high- temperature gases or direct flames from  penetrating the busway interior.The surface receives galvanization plus fire-resistant coating(when exposed to fire,this coating expands at exponential rates to form a dense carbonized insulation layer,sealing all enclosure gaps against heat penetration).

◆Joints incorporate dedicated fire-resistant insulation assemblies for reliable and convenient connections.

Insulation Configuration

NHXLC Series Busway Fire-Resistant Insulation System utilizes alumina high-temperature ceramic components for insulation support,capable of withstanding temperatures up to 1000°C.The copper busbar conductors are insulated with a composite wrapping of polyimide(commonly known as "gold tape")and high-temperature mica tape.Polyimide,recognized as the most advanced insulation material in the electrical industry,offers excellent high-temperature resistance and dielectric properties with a dielectric strength ≥22,000V and no toxic gas emissions under extreme heat.The mica tape withstands 960-1000°C for 1.5 hours,meeting Class A fire resistance requirements per IEC60331-3-8and GB 12666.6 standards.

Product Features

1.Water Resistance Performance:Encapsulated with high-performance insulating resin,the system demonstrates exceptional air tightness and water tightness,achieving IP68 protection rating-the highest level that prevents dust ingress and ensures long-term reliable operation even during continuous submersion.

2.Fire Resistance Performance:The self-extinguishing insulating resin material achieves Class A fire resistance with F120 fire rating, maintaining circuit integrity for over 90 minutes in 950-1000°C flames.Being halogen-free,it releases no toxic fumes under high-temperature    conditions.

3.Corrosion Resistance Performance:Unlike metal-enclosed busways vulnerable to acid rain corrosion,the cast epoxy resin formulation provides superior chemical resistance,effectively  withstanding corrosive gases from chemical plants and splash exposure to corrosive liquids.

Scope of application

NHXLC Fire-Resistant Busway is designed for power distribution systems with rated voltage up to 690V,rated operating current from 250A to 6300A,and frequency of 50-60Hz.Developed based on the NHXLC busway platform and adapted to domestic conditions,this series represents a new generation of fire-resistant busways.Through years of testing,trial production,and industrial trial operations,its electrical performance,fire resistance,and structural integrity have achieved technologically advanced levels by domestic standards.

Technical Parameter